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BACKHEAD / FEED TUBE ASSEMBLY
Place the backhead on the bench with the API threads facing down. Install the
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backhead o-rings into the grooves located on the thread diameter.
Place the check valve and check valve spring in the backhead.
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Place the feed tube o-ring into the groove located just under the pin hole of the feed
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tube.
Drop the choke into the feed tube and using the small rod, tap the choke in place.
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A hammer with a plastic feed tube does not utilize a choke.
Using a drift pin, tap the plug into the feed tube until it seats against the shoulder.
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Using a rubber mallet, tap the feed tube into the backhead, aligning the hole in the
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feed tube with the hole in the backhead.
Using a rubber mallet, tap the pin into the hole.
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Place the thrust washer (1/2" thick on non-HD model) over the backhead threads until
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it rests against the backhead shoulder.
HAMMER ASSEMBLY CONTINUED
Place the hammer horizontally on a hammer stand and secure with a chain vise.
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THE ACCEPTABLE CLAMPING AREAS START 8" (203 MM) FROM EITHER CASE END, TO
AN ADDITIONAL 5" (127 MM) BEYOND THIS POINT. PLACING THE CHAIN VISE ON
THE AREA OF THE CASE WHERE THE PISTON CYCLES CAN DISTORT THE CASE, RESTRICT
PISTON MOVEMENT AND VOID THE WARRANTY.
Slide the piston in the backhead end of the case. Push the piston all the way to the
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chuck end. The piston should ride in the case very smoothly.
Using an appropriate lifting device, stand the hammer case up in a vertical position
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with the chuck end on the ground.
Using an appropriate lifting device, lower the backhead / feed tube assembly into
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the case. Thread the backhead / feed tube assembly into the case until it shoulders
up.
Using an appropriate lifting device, lower the hammer assembly over the chuck/bit
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assembly. Thread the chuck/bit assembly into the case and hand tighten. The chuck
should shoulder against the thrust washer and case, with no gap present.
Page 12
CAUTION
Patriot
125/125HD
02/09/23
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